Stats Test 2 Review, Scatterplots

Front

What is a scatterplot?

Back

A scatterplot is a graphical representation of two variables, showing the relationship between them using points on a Cartesian plane.

Front

What does the slope of a linear regression line represent?

Back

The slope indicates the rate of change of the dependent variable (y) for each unit change in the independent variable (x).

Front

What does an r value of -0.75 indicate about the relationship between two variables?

Back

It indicates a strong negative correlation, meaning as one variable increases, the other tends to decrease.

Front

What does an r value of -0.98 indicate?

Back

It indicates a very strong negative correlation between the two variables.

Front

What does an r value of 0.15 indicate?

Back

It indicates a weak positive correlation between the two variables.

Front

How do you interpret a scatterplot with a negative slope?

Back

It indicates that as one variable increases, the other variable tends to decrease.

Front

What is the equation of a linear regression line?

Back

The equation is typically in the form y = mx + b, where m is the slope and b is the y-intercept.

Front

What does a positive correlation mean?

Back

A positive correlation means that as one variable increases, the other variable also tends to increase.

Front

What is the significance of the y-intercept in a linear regression equation?

Back

The y-intercept is the value of y when x is zero; it represents the starting point of the line on the y-axis.

Front

What does a negative correlation mean?

Back

A negative correlation means that as one variable increases, the other variable tends to decrease.